The most immutable barrier in nature is between one man's thoughts and another's.

Man alone of all the creatures of earth can change his own pattern. Man alone is the architect of his own destiny.

Whilst part of what we perceive comes through our senses from the object before us, another part (and it may be the larger part) always comes out of our own mind.

The first thing to learn in intercourse with others is non-interference with their own particular ways of being happy, provided those ways do not assume to interfere by violence with ours.

If any organism fails to fulfill its potentialities, it becomes sick.

Pessimism leads to weakness. Optimism leads to power.

If merely 'feeling good' could decide, drunkenness would be the supremely valid human experience.